Are you sure? It's working for me.
An example. FYI, it is automatic.
Yeah, I just tried it, but just like you nothing happens after I paste everything.

Anyway if you're still looking for online verifier try this
http://www.coinig.com/Didn't know about it. Thanks for the link!
Verifying signed messages does not expose your private keys and now the site is working good.
Might be that the first tab is working but the second tab isnt.
Yeah, might be correct that giving out that link might lead one or another newbie in using the websites wallet. Probably its better to find an alternative.